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use super::BASE32;
#[derive(Debug)]
pub enum Error {
ReadHash(String),
InvalidBytes,
}
pub const BLAKE3_BYTES: usize = 32;
#[derive(Clone, Copy, Eq, PartialEq, Hash, PartialOrd, Ord)]
pub enum Hash {
Blake3([u8; BLAKE3_BYTES]),
}
pub enum Hasher {
Blake3(blake3::Hasher),
}
impl Default for Hasher {
fn default() -> Self {
Hasher::Blake3(blake3::Hasher::new())
}
}
impl Hasher {
pub fn update(&mut self, bytes: &[u8]) {
match self {
Hasher::Blake3(ref mut h) => {
h.update(bytes);
}
}
}
pub fn finish(&self) -> Hash {
match self {
Hasher::Blake3(ref h) => {
let result = h.finalize();
let mut hash = [0; BLAKE3_BYTES];
hash.clone_from_slice(result.as_bytes());
Hash::Blake3(hash)
}
}
}
}
impl std::fmt::Debug for Hash {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(fmt, "{}", self.to_base32())
}
}
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
enum Algo {
Blake3 = 1,
}
impl Hash {
pub fn to_bytes(self) -> [u8; 1 + BLAKE3_BYTES] {
match self {
Hash::Blake3(ref s) => {
let mut out = [0; 1 + BLAKE3_BYTES];
out[0] = Algo::Blake3 as u8;
out[1..].clone_from_slice(s);
out
}
}
}
pub fn from_bytes(s: &[u8]) -> Option<Self> {
if s.len() >= 1 + BLAKE3_BYTES && s[0] == Algo::Blake3 as u8 {
let mut out = [0; BLAKE3_BYTES];
out.clone_from_slice(&s[1..]);
Some(Hash::Blake3(out))
} else {
None
}
}
pub fn validate(s: &[u8]) -> Result<(), Error> {
if s.len() >= 1 + BLAKE3_BYTES && s[0] == Algo::Blake3 as u8 {
Ok(())
} else {
Err(Error::InvalidBytes)
}
}
pub fn to_base32(self) -> String {
let hash = self.to_bytes();
BASE32.encode(&hash)
}
pub fn from_base32(s: &[u8]) -> Option<Self> {
let bytes = BASE32.decode(s).ok()?;
Self::from_bytes(&bytes)
}
}
impl std::str::FromStr for Hash {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
if let Some(b) = Self::from_base32(s.as_bytes()) {
Ok(b)
} else {
Err(Error::ReadHash(s.to_string()))
}
}
}
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